Unique viscosity mutation of multi-generation hyperbranched waterborne polyurethane
-
Heng Li
,
Yibiao Li
Abstract
Different generation hyperbranched polyurethanes (HBPUs) were synthesized through the A2+B’B2 strategy. The molecular structures and viscosity were characterized by nuclear magnetic resonance (NMR) spectroscopy and gel permeation chromatography (GPC). The NMR results confirmed the formation of the branched units between the segments contained in the HBPU structure. The GPC with a four-capillary bridge design differential viscometer and the Ubbelohde viscometer showed a different viscosity. For the HBPUs, the viscosity first increased to higher values then decreased to lower values, and finally increased with increasing weight, which can be attributed to the spherical structure. The growth degree of HBPUs spherical structure depends on the forming hydrogen bonds; when the hydrogen bonds reach a certain degree, the spherical structure becomes compact.
Acknowledgments
This work was supported by the National Science Foundation of China with Grant no. 51302107, and by the Guangdong Province Department University Industry Cooperation project (Grants nos. 2012A090300004 and 2012B091000077).
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©2014 by De Gruyter
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Articles in the same Issue
- Frontmatter
- Editorial
- Editorial improvements at the Journal of Polymer Engineering
- Original articles
- Cationic copolymerization of 1,3-pentadiene with α-pinene
- In vitro degradation of polyglycolic acid synthesized by a one-step reaction
- Synthesis of a novel class of mixed-type surfmers and their properties in water
- Unique viscosity mutation of multi-generation hyperbranched waterborne polyurethane
- Preparation and characterization of oxidized starch-graft-poly(styrene-butyl acrylate) latex via emulsion polymerization
- Peroxide vulcanization of natural rubber. Part I: effect of temperature and peroxide concentration
- The stimuli-response characters of hydrogels prepared using ultrasound
- A new conductometric biosensor based on horseradish peroxidase immobilized on chitosan and chitosan/gold nanoparticle films
- A new approach for the development of textile waste cotton reinforced composites (T-FRP): laminated hybridization vs. coupling agents
- Effects of the surface treatment of wollastonite on the tensile and flow properties for reinforced polypropylene composites
- Effect of the quenching temperature on the mechanical and thermophysical properties of polycarbonate pigmented with titanium dioxide
- Processing and characterization of poly(lactic acid) blended with polycarbonate and chain extender
- Characteristics analysis and mold design for ultrasonic-assisted injection molding
